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Physico-chimie et rhéologie de géopolymères frais pour la cimentation des puits pétroliers

Abstract : Geopolymers appear as a potential alternative to the conventional cement materials. Alkali aluminosilicate materials also called geopolymers are amorphous materials produced from metakaolin or fly-ash reacting with alkali hydroxide/alkali silicate solution. The aim of this thesis is to evaluate the potential of geopolymers for the construction of oil wells. The lack of knowledge on the rheological behavior and on the mechanical and chemical evolution from mixing to setting of geopolymers, guided this thesis. Therefore, techniques as diverse as NMR, SAXS, DLS and USWR have been mobilized to explain the rheological and mechanical observations. Initially, we studied the viscosity of one of the reactant of geopolymerization : the alkaline liquor. We have shown that variations of the viscosity can be explained thank to considerations of specific volumes of the species in solution. The variations of these specific volumes as a function of composition can be rationalized by invoking phenomena such as molar excess volume, linked to the solvation of ions and ion pairing. Once the liquor's viscosity is known, it is possible to follow the evolution of the rheological proprieties of the suspensions of metakaolin, in the early hours of reaction, as a function of the composition and temperature. Finally, a combined monitoring of the dissolution of metakaolin by solid state NMR, and of the development of the mechanical properties of the geopolymer matrix from mixing to hardening by USWR allowed to conclude that the dissolution of metakaolin is the limiting step of the geopolymerization.
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Submitted on : Friday, January 14, 2011 - 2:46:32 PM
Last modification on : Wednesday, October 14, 2020 - 4:18:15 AM
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  • HAL Id : pastel-00555812, version 1

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Arnaud Bourlon. Physico-chimie et rhéologie de géopolymères frais pour la cimentation des puits pétroliers. Chimie-Physique [physics.chem-ph]. Université Pierre et Marie Curie - Paris VI, 2010. Français. ⟨pastel-00555812⟩

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